diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 9e3af307aae1c3e50c506aadb776b4cda4549224..eb5ff0531cfb33cf41df0a089bf8eb7a0119099f 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3341,6 +3341,7 @@ static irqreturn_t do_cciss_intr(int irq, void *dev_id)
 					printk(KERN_WARNING
 					       "cciss: controller cciss%d failed, stopping.\n",
 					       h->ctlr);
+					spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
 					fail_all_cmds(h->ctlr);
 					return IRQ_HANDLED;
 				}